Hi,
I am getting the lockdep warning below on a imx6q-sabred running 5.14.9.
Haven't debugged this yet, but just wanted to report in case someone
has any suggestions.
Thanks,
Fabio Estevam
[ 4.913294] imx-drm display-subsystem: bound imx-ipuv3-crtc.2 (ops
ipu_crtc_ops)
[ 4.921640] imx-drm display-subsystem: bound imx-ipuv3-crtc.3 (ops
ipu_crtc_ops)
[ 4.929798] imx-drm display-subsystem: bound imx-ipuv3-crtc.6 (ops
ipu_crtc_ops)
[ 4.937977] imx-drm display-subsystem: bound imx-ipuv3-crtc.7 (ops
ipu_crtc_ops)
[ 4.946850] imx-drm display-subsystem: bound 120000.hdmi (ops
dw_hdmi_imx_ops)
[ 4.954685] imx-drm display-subsystem: bound ldb (ops imx_ldb_ops)
[ 4.966943] [drm] Initialized imx-drm 1.0.0 20120507 for
display-subsystem on minor 0
[ 5.001801]
[ 5.001811] ======================================================
[ 5.001817] WARNING: possible circular locking dependency detected
[ 5.001824] 5.14.9-01225-g45da36cc6fcc-dirty #1 Tainted: G W
[ 5.001833] ------------------------------------------------------
[ 5.001838] kworker/u8:0/7 is trying to acquire lock:
[ 5.001848] c1752080 (regulator_list_mutex){+.+.}-{3:3}, at:
regulator_lock_dependent+0x40/0x294
[ 5.001903]
[ 5.001903] but task is already holding lock:
[ 5.001909] c176df78 (dma_fence_map){++++}-{0:0}, at:
imx_drm_atomic_commit_tail+0x10/0x160
[ 5.001957]
[ 5.001957] which lock already depends on the new lock.
[ 5.001957]
[ 5.001963]
[ 5.001963] the existing dependency chain (in reverse order) is:
[ 5.001968]
[ 5.001968] -> #3 (dma_fence_map){++++}-{0:0}:
[ 5.001993] dma_resv_lockdep+0x1c4/0x2b8
[ 5.002010] do_one_initcall+0x84/0x3b8
[ 5.002026] kernel_init_freeable+0x198/0x22c
[ 5.002040] kernel_init+0x10/0x128
[ 5.002061] ret_from_fork+0x14/0x38
[ 5.002072] 0x0
[ 5.002081]
[ 5.002081] -> #2 (fs_reclaim){+.+.}-{0:0}:
[ 5.002105] kmem_cache_alloc+0x28/0x38c
[ 5.002125] __d_alloc+0x20/0x224
[ 5.002141] d_alloc+0x10/0x60
[ 5.002152] d_alloc_parallel+0x48/0xa60
[ 5.002165] __lookup_slow+0x8c/0x178
[ 5.002184] lookup_one_len+0x98/0xd8
[ 5.002196] start_creating+0x94/0x14c
[ 5.002216] debugfs_create_dir+0x10/0x100
[ 5.002231] pinctrl_init+0x1c/0xd4
[ 5.002247] do_one_initcall+0x84/0x3b8
[ 5.002259] kernel_init_freeable+0x198/0x22c
[ 5.002271] kernel_init+0x10/0x128
[ 5.002286] ret_from_fork+0x14/0x38
[ 5.002296] 0x0
[ 5.002303]
[ 5.002303] -> #1 (&sb->s_type->i_mutex_key#2){+.+.}-{3:3}:
[ 5.002335] simple_recursive_removal+0x54/0x33c
[ 5.002350] debugfs_remove+0x30/0x4c
[ 5.002364] _regulator_put.part.0+0x30/0x1d8
[ 5.002383] regulator_put+0x2c/0x3c
[ 5.002395] release_nodes+0x50/0x190
[ 5.002415] devres_release_all+0x80/0xd4
[ 5.002426] really_probe+0xd4/0x314
[ 5.002438] __driver_probe_device+0x80/0xe4
[ 5.002449] driver_probe_device+0x30/0xd4
[ 5.002459] __driver_attach_async_helper+0x20/0x38
[ 5.002470] async_run_entry_fn+0x20/0xb4
[ 5.002483] process_one_work+0x2a0/0x7c0
[ 5.002500] worker_thread+0x30/0x510
[ 5.002512] kthread+0x154/0x17c
[ 5.002526] ret_from_fork+0x14/0x38
[ 5.002537] 0x0
[ 5.002546]
[ 5.002546] -> #0 (regulator_list_mutex){+.+.}-{3:3}:
[ 5.002569] lock_acquire+0x13c/0x418
[ 5.002581] __mutex_lock+0x94/0x97c
[ 5.002595] mutex_lock_nested+0x1c/0x24
[ 5.002605] regulator_lock_dependent+0x40/0x294
[ 5.002622] regulator_enable+0x2c/0xec
[ 5.002632] panel_simple_resume+0x38/0x1f4
[ 5.002648] __rpm_callback+0x3c/0x108
[ 5.002661] rpm_callback+0x68/0x70
[ 5.002671] rpm_resume+0x604/0x7f4
[ 5.002681] __pm_runtime_resume+0x64/0x90
[ 5.002692] panel_simple_prepare+0x2c/0x50
[ 5.002703] imx_ldb_encoder_enable+0x58/0x2b0
[ 5.002715] drm_atomic_helper_commit_modeset_enables+0x230/0x26c
[ 5.002734] imx_drm_atomic_commit_tail+0x3c/0x160
[ 5.002753] commit_tail+0x9c/0x18c
[ 5.002766] drm_atomic_helper_commit+0x158/0x18c
[ 5.002778] drm_client_modeset_commit_atomic+0x23c/0x288
[ 5.002795] drm_client_modeset_commit_locked+0x60/0x1d0
[ 5.002806] drm_client_modeset_commit+0x24/0x40
[ 5.002819] __drm_fb_helper_restore_fbdev_mode_unlocked+0x9c/0xc8
[ 5.002835] drm_fb_helper_set_par+0x38/0x68
[ 5.002845] fbcon_init+0x2bc/0x550
[ 5.002862] visual_init+0xbc/0x104
[ 5.002881] do_bind_con_driver+0x1c8/0x3b0
[ 5.002896] do_take_over_console+0x134/0x1f0
[ 5.002910] do_fbcon_takeover+0x60/0xc0
[ 5.002924] register_framebuffer+0x1c8/0x2e8
[ 5.002936] __drm_fb_helper_initial_config_and_unlock+0x3c8/0x614
[ 5.002950] drm_fbdev_client_hotplug+0xf8/0x194
[ 5.002961] drm_fbdev_generic_setup+0x9c/0x194
[ 5.002971] imx_drm_bind+0xe0/0x124
[ 5.002985] try_to_bring_up_master+0x15c/0x1a8
[ 5.003002] __component_add+0x94/0x140
[ 5.003013] imx_ldb_probe+0x32c/0x4e8
[ 5.003025] platform_probe+0x58/0xb8
[ 5.003040] really_probe+0x14c/0x314
[ 5.003050] __driver_probe_device+0x80/0xe4
[ 5.003060] driver_probe_device+0x30/0xd4
[ 5.003070] __device_attach_driver+0x8c/0xb4
[ 5.003081] bus_for_each_drv+0x80/0xd0
[ 5.003093] __device_attach+0xec/0x160
[ 5.003105] bus_probe_device+0x88/0x90
[ 5.003116] deferred_probe_work_func+0x7c/0xac
[ 5.003127] process_one_work+0x2a0/0x7c0
[ 5.003143] worker_thread+0x30/0x510
[ 5.003154] kthread+0x154/0x17c
[ 5.003164] ret_from_fork+0x14/0x38
[ 5.003174] 0x0
[ 5.003182]
[ 5.003182] other info that might help us debug this:
[ 5.003182]
[ 5.003188] Chain exists of:
[ 5.003188] regulator_list_mutex --> fs_reclaim --> dma_fence_map
[ 5.003188]
[ 5.003218] Possible unsafe locking scenario:
[ 5.003218]
[ 5.003222] CPU0 CPU1
[ 5.003227] ---- ----
[ 5.003232] lock(dma_fence_map);
[ 5.003244] lock(fs_reclaim);
[ 5.003257] lock(dma_fence_map);
[ 5.003269] lock(regulator_list_mutex);
[ 5.003280]
[ 5.003280] *** DEADLOCK ***
[ 5.003280]
[ 5.003284] 13 locks held by kworker/u8:0/7:
[ 5.003292] #0: c2006ca8
((wq_completion)events_unbound){+.+.}-{0:0}, at:
process_one_work+0x1ec/0x7c0
[ 5.003331] #1: c20c9f28 (deferred_probe_work){+.+.}-{0:0}, at:
process_one_work+0x1ec/0x7c0
[ 5.003367] #2: c21448d8 (&dev->mutex){....}-{3:3}, at:
__device_attach+0x30/0x160
[ 5.003404] #3: c1769c90 (component_mutex){+.+.}-{3:3}, at:
__component_add+0x44/0x140
[ 5.003440] #4: c174c8f4 (registration_lock){+.+.}-{3:3}, at:
register_framebuffer+0x28/0x2e8
[ 5.003475] #5: c1618454 (console_lock){+.+.}-{0:0}, at:
register_framebuffer+0x248/0x2e8
[ 5.003508] #6: c263dc48 (&fb_info->lock){+.+.}-{3:3}, at:
register_framebuffer+0x1c0/0x2e8
[ 5.003543] #7: c2b8fb6c (&helper->lock){+.+.}-{3:3}, at:
__drm_fb_helper_restore_fbdev_mode_unlocked+0x4c/0xc8
[ 5.003578] #8: c2be90e8 (&dev->master_mutex){+.+.}-{3:3}, at:
drm_master_internal_acquire+0x18/0x3c
[ 5.003614] #9: c2b8fa50 (&client->modeset_mutex){+.+.}-{3:3}, at:
drm_client_modeset_commit_locked+0x20/0x1d0
[ 5.003653] #10: c20c9ae0 (crtc_ww_class_acquire){+.+.}-{0:0}, at:
drm_client_modeset_commit_atomic+0x34/0x288
[ 5.003691] #11: c263c488 (crtc_ww_class_mutex){+.+.}-{3:3}, at:
drm_modeset_backoff+0x90/0x228
[ 5.003734] #12: c176df78 (dma_fence_map){++++}-{0:0}, at:
imx_drm_atomic_commit_tail+0x10/0x160
[ 5.003775]
[ 5.003775] stack backtrace:
[ 5.003783] CPU: 0 PID: 7 Comm: kworker/u8:0 Tainted: G W
5.14.9-01225-g45da36cc6fcc-dirty #1
[ 5.003797] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 5.003808] Workqueue: events_unbound deferred_probe_work_func
[ 5.003831] [<c01119b0>] (unwind_backtrace) from [<c010c020>]
(show_stack+0x10/0x14)
[ 5.003860] [<c010c020>] (show_stack) from [<c0e76ab0>]
(dump_stack_lvl+0x58/0x70)
[ 5.003887] [<c0e76ab0>] (dump_stack_lvl) from [<c0188dd4>]
(check_noncircular+0xf4/0x168)
[ 5.003917] [<c0188dd4>] (check_noncircular) from [<c018cc78>]
(__lock_acquire+0x1698/0x3208)
[ 5.003938] [<c018cc78>] (__lock_acquire) from [<c018f274>]
(lock_acquire+0x13c/0x418)
[ 5.003955] [<c018f274>] (lock_acquire) from [<c0e88c18>]
(__mutex_lock+0x94/0x97c)
[ 5.003974] [<c0e88c18>] (__mutex_lock) from [<c0e8951c>]
(mutex_lock_nested+0x1c/0x24)
[ 5.003991] [<c0e8951c>] (mutex_lock_nested) from [<c06aecdc>]
(regulator_lock_dependent+0x40/0x294)
[ 5.004019] [<c06aecdc>] (regulator_lock_dependent) from
[<c06b26cc>] (regulator_enable+0x2c/0xec)
[ 5.004039] [<c06b26cc>] (regulator_enable) from [<c07ce850>]
(panel_simple_resume+0x38/0x1f4)
[ 5.004062] [<c07ce850>] (panel_simple_resume) from [<c080698c>]
(__rpm_callback+0x3c/0x108)
[ 5.004082] [<c080698c>] (__rpm_callback) from [<c0806ac0>]
(rpm_callback+0x68/0x70)
[ 5.004098] [<c0806ac0>] (rpm_callback) from [<c08065e4>]
(rpm_resume+0x604/0x7f4)
[ 5.004114] [<c08065e4>] (rpm_resume) from [<c0806838>]
(__pm_runtime_resume+0x64/0x90)
[ 5.004131] [<c0806838>] (__pm_runtime_resume) from [<c07ce69c>]
(panel_simple_prepare+0x2c/0x50)
[ 5.004149] [<c07ce69c>] (panel_simple_prepare) from [<c07ccfa0>]
(imx_ldb_encoder_enable+0x58/0x2b0)
[ 5.004169] [<c07ccfa0>] (imx_ldb_encoder_enable) from [<c07043f8>]
(drm_atomic_helper_commit_modeset_enables+0x230/0x26c)
[ 5.004194] [<c07043f8>] (drm_atomic_helper_commit_modeset_enables)
from [<c07c8bf8>] (imx_drm_atomic_commit_tail+0x3c/0x160)
[ 5.004222] [<c07c8bf8>] (imx_drm_atomic_commit_tail) from
[<c07060a0>] (commit_tail+0x9c/0x18c)
[ 5.004244] [<c07060a0>] (commit_tail) from [<c07062f0>]
(drm_atomic_helper_commit+0x158/0x18c)
[ 5.004266] [<c07062f0>] (drm_atomic_helper_commit) from
[<c073b678>] (drm_client_modeset_commit_atomic+0x23c/0x288)
[ 5.004290] [<c073b678>] (drm_client_modeset_commit_atomic) from
[<c073b794>] (drm_client_modeset_commit_locked+0x60/0x1d0)
[ 5.004311] [<c073b794>] (drm_client_modeset_commit_locked) from
[<c073b928>] (drm_client_modeset_commit+0x24/0x40)
[ 5.004330] [<c073b928>] (drm_client_modeset_commit) from
[<c070c474>] (__drm_fb_helper_restore_fbdev_mode_unlocked+0x9c/0xc8)
[ 5.004353] [<c070c474>]
(__drm_fb_helper_restore_fbdev_mode_unlocked) from [<c070c508>]
(drm_fb_helper_set_par+0x38/0x68)
[ 5.004373] [<c070c508>] (drm_fb_helper_set_par) from [<c0677938>]
(fbcon_init+0x2bc/0x550)
[ 5.004395] [<c0677938>] (fbcon_init) from [<c06d7144>]
(visual_init+0xbc/0x104)
[ 5.004419] [<c06d7144>] (visual_init) from [<c06d8574>]
(do_bind_con_driver+0x1c8/0x3b0)
[ 5.004440] [<c06d8574>] (do_bind_con_driver) from [<c06d8ab8>]
(do_take_over_console+0x134/0x1f0)
[ 5.004462] [<c06d8ab8>] (do_take_over_console) from [<c067557c>]
(do_fbcon_takeover+0x60/0xc0)
[ 5.004484] [<c067557c>] (do_fbcon_takeover) from [<c066da40>]
(register_framebuffer+0x1c8/0x2e8)
[ 5.004503] [<c066da40>] (register_framebuffer) from [<c070be0c>]
(__drm_fb_helper_initial_config_and_unlock+0x3c8/0x614)
[ 5.004522] [<c070be0c>]
(__drm_fb_helper_initial_config_and_unlock) from [<c070c744>]
(drm_fbdev_client_hotplug+0xf8/0x194)
[ 5.004541] [<c070c744>] (drm_fbdev_client_hotplug) from
[<c070c87c>] (drm_fbdev_generic_setup+0x9c/0x194)
[ 5.004559] [<c070c87c>] (drm_fbdev_generic_setup) from
[<c07c8b78>] (imx_drm_bind+0xe0/0x124)
[ 5.004583] [<c07c8b78>] (imx_drm_bind) from [<c07f0ce4>]
(try_to_bring_up_master+0x15c/0x1a8)
[ 5.004608] [<c07f0ce4>] (try_to_bring_up_master) from [<c07f0dc4>]
(__component_add+0x94/0x140)
[ 5.004628] [<c07f0dc4>] (__component_add) from [<c07cc9dc>]
(imx_ldb_probe+0x32c/0x4e8)
[ 5.004647] [<c07cc9dc>] (imx_ldb_probe) from [<c07fae98>]
(platform_probe+0x58/0xb8)
[ 5.004670] [<c07fae98>] (platform_probe) from [<c07f8748>]
(really_probe+0x14c/0x314)
[ 5.004690] [<c07f8748>] (really_probe) from [<c07f8990>]
(__driver_probe_device+0x80/0xe4)
[ 5.004709] [<c07f8990>] (__driver_probe_device) from [<c07f8a24>]
(driver_probe_device+0x30/0xd4)
[ 5.004728] [<c07f8a24>] (driver_probe_device) from [<c07f8d40>]
(__device_attach_driver+0x8c/0xb4)
[ 5.004748] [<c07f8d40>] (__device_attach_driver) from [<c07f6b0c>]
(bus_for_each_drv+0x80/0xd0)
[ 5.004767] [<c07f6b0c>] (bus_for_each_drv) from [<c07f8580>]
(__device_attach+0xec/0x160)
[ 5.004785] [<c07f8580>] (__device_attach) from [<c07f77e0>]
(bus_probe_device+0x88/0x90)
[ 5.004803] [<c07f77e0>] (bus_probe_device) from [<c07f7c9c>]
(deferred_probe_work_func+0x7c/0xac)
[ 5.004820] [<c07f7c9c>] (deferred_probe_work_func) from
[<c0147cc0>] (process_one_work+0x2a0/0x7c0)
[ 5.004845] [<c0147cc0>] (process_one_work) from [<c0148210>]
(worker_thread+0x30/0x510)
[ 5.004865] [<c0148210>] (worker_thread) from [<c0151088>]
(kthread+0x154/0x17c)
[ 5.004885] [<c0151088>] (kthread) from [<c010013c>]
(ret_from_fork+0x14/0x38)
[ 5.004904] Exception stack(0xc20c9fb0 to 0xc20c9ff8)
[ 5.004916] 9fa0: 00000000
00000000 00000000 00000000
[ 5.004929] 9fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 5.004940] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 5.054205] Console: switching to colour frame buffer device 128x48
[ 6.236262] imx-drm display-subsystem: [drm] fb0: imx-drm frame buffer device
[ 6.251485] etnaviv etnaviv: bound 130000.gpu (ops gpu_ops)
[ 6.257459] etnaviv etnaviv: bound 134000.gpu (ops gpu_ops)
[ 6.263513] etnaviv etnaviv: bound 2204000.gpu (ops gpu_ops)
[ 6.269228] etnaviv-gpu 130000.gpu: model: GC2000, revision: 5108
[ 6.275723] etnaviv-gpu 134000.gpu: model: GC320, revision: 5007
[ 6.281932] etnaviv-gpu 2204000.gpu: model: GC355, revision: 1215
[ 6.288047] etnaviv-gpu 2204000.gpu: Ignoring GPU with VG and FE2.0
[ 6.295155] [drm] Initialized etnaviv 1.3.0 20151214 for etnaviv on minor 1
